Bushings for Fox RP-23 on Ellsworth Truth?

I am building up a new -2008ish Pre SST Truth frame. I want to install a FOX RP-23 rear shock , and am in need of a new set of reducers for the shock. Does anyone know either the measurements I need? I know Cambria carries most sizes, but I just do not know the size needed. Thanks

Thanks. For some reason I thought the adapters came from the bike companies, but you are right-Fox had them, and has an interactive section on their website to find them. Here is where that is in case anyone else ever is looking for them. They had them in stock and shipped them same day.